Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f76c798f7eaa67…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 11:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 562eee0c7e73d9b0a566bf7ac8ded87a SHA-1: 1f8a18b997036ef7f5b16f07f09ae2be28ce8eca SHA-256: 66f76c798f7eaa6752f779c87fed3a5f11648c2abe485e54775732eb97524a0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristics identified the document as a link farm on disposable hosting, containing numerous external URIs pointing to various domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=best+pc+emulator+android
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/46063377447.pdf
    • https://webmanagement.colortown.ro/images/file/figugawimapefexijiz.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/46900354435.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c3850b0ea46739872efdd2caedf9907/jetora.pdf
    • http://mientrungland.net/uploads/image/files/48706562802.pdf
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/revamitaziveza.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/51811425879.pdf
    • http://siciny.eu/userfiles/file/vuledu.pdf
    • http://physio-praxismitte.de/userfiles/mosusezomosivamerisid.pdf
    • http://dreamsurgeryen.net/ckupload/files/31315695495.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614561a708a94---40413790062.pdf
    • http://bilcafe.it/userfiles/file/fafolo.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/15488718573.pdf
    • https://smartstone.ca/userfiles/files/nezubok.pdf
    • https://amd-export.com/site/upload/file/31570144293.pdf
    • https://indiantalentjunction.com/milan/media/susuziwajunigesukojolozuk.pdf
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/99778768053.pdf
    • http://asclyziarskyklub.sk/userfiles/file/74410909343.pdf
    • http://akcjonariusz.com/UserFiles/file/14896593806.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/72036294564.pdf
    • http://jarosi.hu/files/file/75054196546.pdf
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/tawexitemanoka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b031.bin
f46af89c414f20f6d190253ec1fb1131d839dc2985d7e099d93a62d33bb47a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 10828 bytes
font_01_sfnt_off0000c926.bin
4c3e286e13bfc417eb9558b7c83f4806dd48593d1612ae123b86950f414e113b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 15472 bytes
font_02_sfnt_off0000f0bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16792 bytes

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